AU2016364261B2

AU2016364261B2 - Piercing needle-equipped cannula

Info

Publication number: AU2016364261B2
Application number: AU2016364261A
Authority: AU
Inventors: Etsuo Murakami
Original assignee: Mani Inc
Current assignee: Mani Inc
Priority date: 2015-11-30
Filing date: 2016-11-29
Publication date: 2020-12-10
Anticipated expiration: 2036-11-29
Also published as: CN108366872B; WO2017094708A1; US10765554B2; RU2723534C2; HK1255857A1; US20180344519A1; EP3381420B1; RU2018123476A3; RU2018123476A; JP6960857B2; AU2016364261A1; EP3381420A4; CN108366872A; EP3381420A1; JPWO2017094708A1

Abstract

Provided is a piercing needle-equipped cannula which is fitted with a piercing needle in advance and which prevents a deformation of a slit part by the piercing needle from remaining after removal of the piercing needle. This piercing needle-equipped cannula (100) has: a cannula (10) used to pierce an eyeball in eye surgery; a cap (13) made of a resin, having a slit (13a), and provided in the cannula (10); and a piercing needle (15) attached to the cannula (10). The piercing needle (15) includes a needle body portion (15c) on the tip side, a base portion (15d) on the base end side, and a slit penetrating portion (15s) that penetrates the slit (13a) while joining the needle body portion (15c) and the base portion (15d) to each other. The cross-sectional area of the slit penetrating portion (15s) is smaller than the cross-sectional area of the thickest part of the needle body portion (15c).

Description

W O 2017/094708 A 1l IIIII ll||IlI llllII|||| I| || II| I I||||||| I|||| i||I|I|I|||||ID |||| | I

T&t;L'*4J 1a-- ZtAt 41i o = a 0- 44tIT-LR-DU LT- ,C7,IJ vL 't Z -L/ (10) tt®ja-L/ (1 0) I~irktX')v, h (1 3 a) t-4tM1o®ytv -(1 3) t, )=a-L' (1 0) IC4~eStVCL' IJ~At (1 5) t, &* ,AJ t(1 5) It 7-Z4RJDt* * ' ( 1 5 c ) t , 6IJ( 1 5 d ) t , t+* *' ( 1 5 c )( 1 5 d) t eMLWtii5TX') ,y h 3 (13a L X')6yhIWA 1 5 s) L, GaLt'), X')y A A ( 1 5 s ) O® r iEf, t+* ( 1 5 c ) t- L4r E )tI/J ' ]+ 4At JZ a L/ (1 00) Lt.7 0

PIERCING NEEDLE-EQUIPPED CANNULA

Technical Field

[0001]

The present invention relates to a piercing needle-equipped cannula having a piercing

needle pre-attached to a cannula used in ophthalmic operations.

Background

[0002]

The cannula is attached to an eyeball, and a surgical tool or the like is passed through

the cannula and used in an ophthalmic operation (e.g., Patent Document 1). FIG. 5 is a

cross-section of atypical cannula. A cannula 110 is configured by fitting the base end part of a

metal pipe 111 into a base 112 made of resin, and covering and enveloping a side surface of the

base 112 and the base end of the pipe 111 by a cap 113 made of resin such as silicone rubber.

[0003]

The base 112 has a function of a stopper by touching the surface of an eyeball when

the pipe 111 is pierced in, and the cap 113 has a function of controlling leakage of vitreous

humor etc. from the inside of the eyeball via the pipe 111.

[0004]

The cap 113 has a slit 113a, which connects the inner side of the pipe 111 and the

outer side of the cap 113, provided in a portion that covers a base end of the pipe 111, and

various surgical tools, optical instruments for monitoring etc. are then inserted in the eyeball

through the slit 113a. Therefore, it is preferable that there is no space between the slit and

the surgical tool etc. so that vitreous humor etc. does not leak when using the surgical tool etc.

[0005]

On the other hand, when attaching such a cannula to an eyeball, a piercing needle is

attached to the cannula and set in a holder that acts as a handle. FIG. 6 is diagram

illustrating a state where a piercing needle and a cannula are pierced into an eyeball. The cannula 110 is attached to an eyeball A in the steps of attaching the point of the piercing needle 115 so as to protrude from the pipe 111 of the cannula 110, piercing the eyeball A with the piercing needle 115 and the pipe 111 in one united body, and pulling out only the piercing needle 115, leaving only the cannula 110 in the eyeball A. At this time, while the piercing needle 115 should be attached to the cannula 110 in advance to save time, this results in deformation of the slit 113a due to the piercing needle 115 when pulling it out. That is, problems may occur where once the piercing needle 115 is pulled out, the slit 113a is not closed tightly, and a gap generates between the slit 113a and the surgical tool etc. at the time of inserting the surgical tool etc., thereby making it easy for the vitreous humor etc. to leak.

Prior Art Documents

Patent Documents

[0006]

[Patent Document 1] WO 2010/126076A

SUMARY

[0006a]

It is an object of the present invention to substantially overcome or at least ameliorate

one or more of the above disadvantages.

[0006b] In a first aspect, the present disclosure provides a piercing needle-equipped

cannula, comprising: a cannula configured to be pierced in an eyeball and used in ophthalmic

operations; a resin cap having a slit opened in the cannula; and a piercing needle attached to

the cannula, wherein the piercing needle is comprised of a needle main body on a front end

side, a base on a base end side, and a slit piercing part connecting the needle main body and

the base, the slit piercing part being configured to pierce the slit, and the cross-sectional area of

the slit piercing part is a flat rectangle and smaller than that of the thickest part of the needle

main body.

[0007]

Some embodiments are intended to provide a piercing needle-equipped cannula that

has a piercing needle pre-attached to the cannula, wherein no deformation of the slit portion

due to the piercing needle is left after the piercing needle is pulled out.

[0008]

A piercing needle-equipped cannula according to the present invention is

characterized by including: a cannula pierced in an eyeball and used in ophthalmic operations;

a resin cap having a slit opened in the cannula; and a piercing needle attached to the cannula.

The piercing needle includes a needle main body on a front end side, a base on a base end side,

and a slit piercing part piercing the slit in a state where the needle main body and the base are

connected, and the cross-sectional area of the slit piercing part is smaller than that of the

thickest part of the needle main body.

[0009]

Here, the material of the slit piercing part may be different from that of the needle

main body, or the slit piercing part may be made of a flexible, extremely thin material.

Moreover, the cross-sectional shape of the slit piercing part may be a circle or a flat rectangle.

Alternatively, the slit piercing part and the base may have the same cross-sectional shape.

Further alternatively, the slit may have a linear shape when viewed from the direction of

inserting the piercing needle, a curved shape including a crescent, or a shape made up of

multiple lines.

[0010]

According to the present invention, as a result of making the opening of the slit small

when attaching the piercing needle to the cannula, there are beneficial effects of no remaining

deformation of the slit portion due to the piercing needle after the piercing needle is pulled out, and thus the slit may be closed tightly.

BRIEF DESCRIPTION OF DRAWINGS

[0011]

FIG. 1 illustrates four types of piercing needles used for a piercing

needle-equipped cannula of the present invention;

FIG. 2 shows illustrations of the piercing needle-equipped cannula, wherein

FIG. 2(a) is a cross-section of the piercing needle, FIG. 2(b) is a cross-section of the

piercing needle-equipped cannula, and FIG. 2(c) is a cross-section of the cannula set in a

holder;

FIG. 3 shows illustrations of a different piercing needle-equipped cannula,

wherein FIG. 3(a) is a cross-section of the piercing needle, FIG. 3(b) is a cross-section of

the piercing needle-equipped cannula, and FIG. 3(c) is a cross-section of the cannula set

in a holder;

FIG. 4 shows illustrations of a different piercing needle-equipped cannula,

wherein FIG. 4(a) is an oblique view of the piercing needle, and FIG. 4(b) is a

cross-section of the cannula set in a holder;

FIG. 5 is a cross-section of a typical cannula; and

FIG. 6 is a diagram illustrating a state where a piercing needle and a cannula

are pierced into an eyeball.

DESCRIPTION OF EMBODIMENTS

[0012]

An embodiment according to the present invention is described below with reference to accompanying drawings.

[0013]

FIG. 1 illustrates four types of piercing needles used for a piercing

needle-equipped cannula of the present invention. Here, a pointed end part of a

piercing needle 15 is a front end 15a, and a pointed end part on the opposite side is a

base end 15b.

[0014]

The basic form of the piercing needle 15 includes a needle main body 15c, which

is made from the front end 15a pointed to pierce an eyeball and a cylindrical portion

connecting to the front end 15a, a slit piercing part 15s, which is a portion passing

through the slit when the cannula is attached and connecting to the needle main body

15c, and a base 15d, which is further on the base end 15b side than the slit piercing part

15s. That is, the slit piercing part 15s is a portion connecting the needle main body 15c

and the base 15d.

[0015]

FIG. 1(a) illustrates a needle having a flatter rectangular cross-sectional shape

on the base end 15b side than the slit piercing part 15s, and FIG. 1(b) illustrates a

needle having a flat rectangular cross-sectional shape only near the slit piercing part

15s. FIG. 1(c) illustrates a needle having a round cross-sectional shape smaller in

diameter on the base end 15b side from the slit piercing part 15s than the diameter of

the thickest part of the needle main body 15c, and FIG. 1(d) illustrates a needle having

a round cross-sectional shape smaller in diameter only near the slit piercing part 15s

than the diameter of the thickest part of the needle main body 15c. In other words, the

cross-sectional shapes of the slit piercing part 15s and the base end 15d in FIG. 1(a) and

FIG. 1(c) are the same.

[0016]

If the cross-sectional shape of the slit piercing part 15s is a flat rectangle as in

FIGS. 1(a) and 1(b), the opening of the slit can be kept small when the piercing needle

15 is attached to the cannula. Moreover, since deformation of the slit can be kept to a

minimum even if the shape is a circle with a small diameter as in FIGS. 1(c) and 1(d),

there is hardly any deformation of the slit left after the piercing needle 15 is pulled out.

[0017]

Note that the cross-sectional shape of the slit piercing part 15s is not limited to

a flat rectangle or small circle as illustrated in FIG. 1, basically as long as the

cross-sectional area is smaller than the thickest part or columnar portion of the needle

main body 15c of the piercing needle 15. This is because if the cross-sectional area is

made small, regardless of cross-sectional shape, there is a specific angle at which the

height of the cross-sectional area is lower than at least the diameter of the columnar

portion of the needle main body 15c, and thus if the piercing needle 15 pierces at such

an angle that the opening of the slit is small, there can at least be little deformation of

the slit. The slit 13a may have a linear shape when viewed from the direction of

inserting the piercing needle, a curved shape including an arc, or a shape made up of

multiple lines.

[0018]

FIG. 2 shows illustrations of the piercing needle-equipped cannula, wherein

holder. FIG. 3 shows illustrations of a different piercing needle-equipped cannula, wherein FIG. 3(a) is a cross-section of the piercing needle, FIG. 3(b) is a cross-section of the piercing needle-equipped cannula, and FIG. 3(c) is a cross-section of the cannula set in a holder. FIG. 2 shows where the cross-sectional shape further on the base end 15b side than the slit piercing part 15s is made smaller in accordance with the cross-sectional shape of the slit piercing part 15s, and FIG. 3 shows where the cross-sectional shape only in the vicinity of the slit piercing part 15s is made smaller.

Note that FIGS. 1(a) and 1(c), and FIGS. 1(b) and 1(d) have nearly the same shapes

when comparing only the respective cross-sectional shapes along the axis of the piercing

needle 15, where FIGS. 1(a) and 1(c) are considered to correspond to FIG. 2, and FIGS.

1(b) and 1(d) are considered to correspond to FIG. 3.

[0019]

The cannula 10 illustrated in FIGS. 2 and 3 has a typical structure in which a

base end part of a metal pipe 11 is fit into a resin base 12, covering and enveloping a

side surface of the base 12 and the base end of the pipe 11 by a cap 13 made of silicone

rubber.

[0020]

When attaching the piercing needle 15 to the cannula 10, the slit piercing part

15s is attached so as to be positioned at the slit 13a opened in the cap 13, and at that

time, a pointed front end 15a of the piercing needle 15 protrudes out from the pipe 11 of

the cannula 10. Note that by making the outer diameter of the cylindrical portion of

the needle main body 15c almost the same as the inner diameter of the pipe 11, rattling

between the piercing needle 15 and a cannula 100 is suppressed.

[0021]

Moreover, when attaching the cannula 10 to the eyeball, the piercing needle-equipped cannula 100 is secured by a holder 16 acting as a handle. The holder

16 secures the base 15d and the periphery of the cap 13, which is attached to the

cannula 10. Note that since the cross-sectional shape of the base 15d is different in

FIGS. 2 and 3, places near the base 15d secured by the holder 16 are appropriate for the

cross-sectional shapes of the respective bases 15d.

[0022]

As shown in FIGS. 2(c) and 3(c), the piercing needle 15 and the pipe 11 of the

cannula 10 are pierced into the eyeball with the holder 16 having secured them. Only

the piercing needle 15 is pulled out while leaving the cannula 10 therewithin, thereby

attaching the cannula 10 to the eyeball. If the piercing needle-equipped cannula 100 of

the present invention is used at this time, after the piercing needle 15 is pulled out, no

deformation of the slit 13a due to the piercing needle 15 is left, making the slit 13a

tightly closed. This allows suppression of vitreous humor etc. from leaking out of the

eyeball, and performance of a safe ophthalmic operation.

[0023]

FIG. 4 shows illustrations of a different piercing needle-equipped cannula,

wherein FIG. 4(a) is an oblique view of the piercing needle, and FIG. 4(b) is a

cross-section of the cannula set in a holder. The piercing needle 15 illustrated here

includes the needle main body 15c on the front end 15a side, the base 15d on the base

end 15b side, and the slit piercing part 15s connecting the needle main body 15c and the

base end 15b.

[0024]

In this case, since the piercing needle 15 illustrated in FIG. 1 is manufactured

as one body, all parts are made from the same material (e.g., austenitic stainless steel, etc.). On the other hand, the piercing needle 15 illustrated in FIG. 4(a) has the slit piercing part 15s made of a flexible, extremely thin material. That is, the needle main body 15c is made of a different material from that of the slit piercing part 15s.

Moreover, if the slit piercing part 15s is very thin, there is a beneficial effect of no

remaining deformation of the slit portion due to the piercing needle. Note that the

flexible, extremely thin material corresponds to thread, string, wire etc., but is not

limited thereto.

[0025]

Furthermore, the base 15d may also be made of a different material than that

of the needle main body 15c. This is because while the needle main body 15c needs to

be made of a material (e.g., austenitic stainless steel, etc.) such as that used for a

conventional piercing needle, so as for the needle main body to pierce the eyeball,

securing it by the holder 16 is sufficient as the base 15d itself does not pierce the

eyeball. Note that the slit piercing part 15s and the base 15d are made of different

materials and have different cross-sectional shapes in FIG. 4; however, alternatively,

they may be made of the same material and have the same cross-sectional shape as in

FIGS. 1(a) and 1(c). In this case where the base 15d and the slit piercing part 15s are

made of the same flexible, extremely thin material, a configuration in which the end

part of the base 15d is secured to the inner side of the holder 16 is possible. However,

the method of securing the base 15d by the holder 16 is not limited.

[0026]

FIG. 4(b) illustrates the cannula set in the holder 16. The piercing

needle-equipped cannula 100 should be stable when piercing the eyeball in this state.

Moreover, since the piercing needle 15 needs to be pulled out after piercing, connections between the needle main body 15c and the slit piercing part 15s and between the slit piercing part 15s and the base 15d require strengthening so as not to detach. As long as the above conditions are fulfilled, the piercing needle 15 may have the structure as in

FIG. 4(a) without any problems, and there is a beneficial effect of no remaining

deformation of the slit portion due to the piercing needle.

Explanation of References

[0027]

10: Cannula

11: Pipe

12: Base

13: Cap

13a: Slit

15: Piercing needle

15a: Front end

15b: Base end

15c: Needle main body

15d: Base

15s: Slit piercing part

16: Holder

100: Piercing needle-equipped cannula

A: Eyeball

Claims

1. A piercing needle-equipped cannula, comprising:

a cannula configured to be pierced in an eyeball and used in ophthalmic operations;

a resin cap having a slit opened in the cannula; and

a piercing needle attached to the cannula, wherein

the piercing needle is comprised of a needle main body on a front end side, a base on a

base end side, and a slit piercing part connecting the needle main body and the base, the slit

piercing part being configured to pierce the slit, and

the cross-sectional area of the slit piercing part is a flat rectangle and smaller than

that of the thickest part of the needle main body.

2. The piercing needle-equipped cannula of Claim 1, wherein the slit piercing part and

the base have the same cross-sectional shape.

Mani, Inc.

Patent Attorneys for the Applicant/Nominated Person

SPRUSON&FERGUSON

FIG. 1

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6